This clean CSS horizontal menu contains tabs with text that shift downwards slightly when the mouse rolls over it. And just for demonstration, it shows how to make the bottom corners of each tab rounded using both CSS3 and Mozilla's proprietary declarations for rounded corners. Note that the rounded corners effect is currently only visible in Firefox (and future CSS3 browsers). The relevant lines within the CSS code are:
-moz-border-radius-bottomleft: 5px;
border-bottom-left-radius: 5px;
-moz-border-radius-bottomright: 5px;
border-bottom-right-radius: 5px

Remove these lines if you're aiming for a consistent look across browsers.

the Html And Css Code just put it in your site :-
<style type="text/css">

/*Credits: Jooria Refresh Your Website */
/*URL: http://www.jooria.com/ */

.invertedshiftdown{
padding: 0;
width: 100%;
border-top: 5px solid #D10000; /*Red color theme*/
background: transparent;
voice-family: "\"}\"";
voice-family: inherit;
}

.invertedshiftdown ul{
margin:0;
margin-left: 40px; /*margin between first menu item and left browser edge*/
padding: 0;
list-style: none;
}

.invertedshiftdown li{
display: inline;
margin: 0 2px 0 0;
padding: 0;
text-transform:uppercase;
}

.invertedshiftdown a{
float: left;
display: block;
font: bold 12px Arial;
color: black;
text-decoration: none;
margin: 0 1px 0 0; /*Margin between each menu item*/
padding: 5px 10px 9px 10px; /*Padding within each menu item*/
background-color: white; /*Default menu color*/

/*BELOW 4 LINES add rounded bottom corners to each menu item.
  ONLY WORKS IN FIREFOX AND FUTURE CSS3 CAPABLE BROWSERS
  REMOVE IF DESIRED*/
-moz-border-radius-bottomleft: 5px;
border-bottom-left-radius: 5px;
-moz-border-radius-bottomright: 5px;
border-bottom-right-radius: 5px;
}

.invertedshiftdown a:hover{
background-color: #D10000; /*Red color theme*/
padding-top: 9px; /*Flip default padding-top value with padding-bottom */
padding-bottom: 5px; /*Flip default padding-bottom value with padding-top*/
color: white;
}

.invertedshiftdown .current a{ /** currently selected menu item **/
background-color: #D10000; /*Red color theme*/
padding-top: 9px; /*Flip default padding-top value with padding-bottom */
padding-bottom: 5px; /*Flip default padding-bottom value with padding-top*/
color: white;
}
</style>
<div class="invertedshiftdown">
<ul>
<li><a href="http://www.jooria.com" title="Home">Home</a></li>
<li><a href="http://www.jooria.com/catgory.html" title="Lessons">Lessons</a></li>
<li class="current"><a href="http://www.jooria.com/s75/PHP-Scripts.html" title="PHP Scripts">PHP Scripts</a></li>
<li><a href="http://www.jooria.com/s76/Ajax-Script.html" title="Ajax Script">Ajax Script</a></li>
</ul>
</div>

<br style="clear: both;" />